When the necessary conditions are met, a two-tail test is being conducted to test the difference between two population means, but your statistical software provides only a one-tail area of 0.045 as part of its output. The p-value for this test will be 0.09.

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Quizplus · Accepted Answer

In a two-tail test, the p-value is calculated by doubling the one-tail area, so if the one-tail area is 0.045, the two-tail p-value would indeed be 0.09.

When the Necessary Conditions Are Met, a Two-Tail Test Is